sedimentary

Small rounded pebble

Unidentified lithic clast; likely fine-grained sandstone, mudstone, or basalt

AI-generated identification · may be incorrect

Dark brown-gray, smooth and subelliptical from abrasion, with a dull to slightly earthy luster; apparent hardness roughly 3–6 Mohs, but mineral composition and cleavage cannot be determined from the image.

Identified August 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely naturally weathered and water-rounded, though its exact formation and geological age are indeterminate without testing or a closer view.

Uses & applications

Primarily a natural curiosity, teaching specimen, or craft object; no reliable industrial or jewelry use can be assigned.

Geological facts

The uniform smoothness and flattened shape indicate transport by water, wave action, or prolonged surface abrasion. A streak, hardness, density, and fresh broken surface would greatly improve identification.

Field identification & locations

Common rounded pebbles occur in stream beds, beaches, glacial deposits, and gravel. Check for visible grains, layering, vesicles, magnetic response, and streak; avoid assuming a specific rock type from color alone.